platform: tegra: ov5693: remove unnecessary delays

platform: tegra: ov5693: remove unnecessary delays

- Remove unnecessary gpio calls and delays
- Update gpio usage when using device tree

Bug 1448154

Change-Id: I51118c8a7bc7ac7f54ee812c0c524d7e482d7733
Signed-off-by: Frank Chen <frankc@nvidia.com>
Reviewed-on: http://git-master/r/364519
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Philip Breczinski <pbreczinski@nvidia.com>
Reviewed-by: Bhushan Rayrikar <brayrikar@nvidia.com>
Reviewed-by: Charlie Huang <chahuang@nvidia.com>
Reviewed-by: Ruicheng Dai <rdai@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>